FI66892C - FOERFARANDE FOER FRAMSTAELLNING AV ASFALTKOMPOSITION FOER VAEGYTOR - Google Patents

Description

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W (11) UTLAGGNINGSSKRIPT 668 92 ^ ^ (51) Kv.lt/Into.3 C 08 L 95/00 FINLAND — FINLAND pi) γκμιμ ^ - ^ ιμμμιιιιιιι 753663 (22) HakambpUvi — Ameknlngadag 29.12.75 (23) AHwpAlvt— GHctghMvdag 29.12.75 (41) Investigate (υΠϋΜίαΙ - BIMt offamig 20.07.76 PBtMltti- and register managed (44) NihcMtaipanon j «kimLJulluiMn pvm.— no ok

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Poland-Poland (PL) P 177 ^ + 16 (71) Instytut Technologii Nafty, ul. Lukasiwicza 1, skr. Pocztowa, 31-1 * 29 Krakow, Poland-Po1en (Pl!) (72) Helena Masiarczyk, Chrzan <5w, Tomasz Szczurek, Krak <5w, Poland-Polen (PL) (7 * 0 Oy Jalo Ant-Wuorinen Ab ( The present invention relates to a method for preparing an asphalt composition for road surfaces, in particular for road surfaces.

In principle, no modifying additives are used in the manufacture of road asphalt due to the large asphalt pavements and the associated costs. In fact, road surface improvement methods are known and widely used, according to which 5% by weight of unvulcanized natural and synthetic rubbers are always added to the asphalt. Regenerated rubber has also been added (obtained by heating rubber waste to 180 ° C at 5 atm in the presence of peptizing and plasticizing agents). These additions improve the durability and adhesion of the asphalt surface (stability, i.e. deformation resistance to high loads, frost resistance, abrasiveness, adhesion to the aggregate). These properties have been observed to a lesser extent in asphalts to which rubber dust has been added.

2,66892

Known asphalts modified with additives of rubber origin are expensive due to the high cost of the raw materials used in the case of rubbers and reclaimed rubber, and also the technique of grinding vulcanized rubber waste with the required particle size of about 0.1 mm is cumbersome and expensive.

The invention relates to a simple process for the preparation of an asphalt composition comprising products formed by the thermal decomposition of rubber waste to modify asphalts. By the term "asphalt" is meant here also all types of bitumens.

According to the invention, the modifying component is obtained by heating and decomposing 1-80% by weight of rubber, rubber waste, used rubber products, such as worn rubber rings in a medium containing petroleum bitumen and / or an extract of selective solvents used in oil refining and / or heavy oils obtained by cracking petroleum products. or heavy coal tar products, at a temperature of 240-380 ° C. The products obtained are distilled, preferably under reduced pressure, or steam distilled, and / or oxidized with compressed air at 200-320 ° C. To this mixture is added an amount of petroleum bitumen containing less than 6% by weight of paraffins and / or natural asphalt that the amount of treated rubber in the finished asphalt composition will be 1-50% by weight. The modifying component is also obtained by heating and decomposing 1-50% by weight of rubber, rubber waste, used rubber products, e.g. worn rubber tires in 99-50% by weight of petroleum bitumen containing less than 6% by weight of para finins, and / or natural asphalt, At a temperature of 240-380 ° C. The mixture thus obtained is distilled, preferably under reduced pressure, or steam-distilled and / or oxidized with compressed air at a temperature of 200 to 320 ° C.

Oxidation with compressed air and / or distillation under reduced pressure and / or steam distillation can increase the softening point of the asphalt obtained and reduce the penetration. It is also possible to separate the low-boiling components from the modifying component by distillation under reduced pressure and / or using steam.

3,66892

By distilling products containing rubber waste, the low-boiling, foul-smelling components of the rubber waste can be removed and as a final product asphalt with a higher Ignition Temperature and higher thermal stability can be obtained.

The asphalt obtained according to the invention has good application properties, in particular thermoplastic properties. Asphalt surfaces obtained by using rubber-modified asphalts have good application properties, in particular good adhesion to tires and high load resistance.

Example I

53 kg of asphalt residue containing 3.2% by weight of paraffin are oxidized with air until the penetration at 25 ° C is 36.

50 kg of the obtained blown asphalt are mixed at a temperature of 38 ° C with 50 kg of granulated spent rubber rings for 10 minutes while blowing superheated steam into the mixture. The resulting mixture is distilled under reduced pressure of 15 mmHg to give asphalt having the following properties:

- softening point according to the ring-and-ball method 6 ° C

- penetration at 25 ° C, load 100 g for 5 seconds 2k mm / 10

- breaking point ...... ........... -7 ° C

- elongation at 15 ° C ................ 8 cm

Example II

90 kg of distillation asphalt with penetration. is 101 mm / 10 at 25 ° C and heated to 280 ° C, 10 kg of granulated spent rubber rings are added and the mixture is stirred at this temperature for 1.5 hours. The resulting mixture is oxidized with air at 200 ° C for 28 hours. Asphalt has the following properties:

- softening point according to the ring-and-ball method 65 ° C

- penetration at 25 ° C, load 100 g for 5 seconds 33 mm / 10

- breaking temperature ...... .......... -9 ° C

Example III

30 kg of furfural extract having a viscosity of 2.6 ° E at 100 ° C and heated to 3 ° C are continuously metered into 70 kg of comminuted rubber rings while stirring and blowing steam into the mixture and heating to 360 ° C. to maintain the temperature.

91 kg of rubber waste solution and 9 kg of oil with a boiling point of 220-38 ° C are obtained.

20 kg of rubber waste solution is mixed with 80 kg of road asphalt with a penetration of 16 mm / 10 at 25 ° C and then homogenized in a tooth mill. The product has the following characteristics: 4 66892

- softening point according to the ring-and-ball method 63 ° C

penetration at 25 ° C, load 100 g for 5 seconds 59 mm / 10

- breaking temperature. . . . · ........... -l6 ° C

- elongation at 15 ° C. ............... 88 cm

Example IV

50 kg of anthracene oil and 50 kg of pre-vulcanized rubber waste are mixed and the mixture is heated at 220 ° C for 15 hours.

8o kg of natural asphalt with a softening point of 11 ° C and a penetration of 0 mm / 10 at 25 ° C are mixed with 20 kg of rubber waste mixture and anthracene oil.

Asphalt with a softening point of 77 ° C and a penetration of 15 mm / 10 at 25 ° C is obtained.

Example V

90 kg of asphalt residue is oxidized with air at a temperature of 260 to 320 ° C. During the oxidation process, 10 kg of ground rubber waste is added in portions.

Homogeneous asphalt is obtained with a softening point of 53 ° C according to the ring-ball method and a penetration of 48 mm / 10 at 25 ° C with a burst temperature of -6 ° C.

66892 5

Example VI;

65 parts by weight of distillation asphalt with a softening temperature of 39 ° C according to the ring-and-ball method and containing 2.9% by weight of paraffin, 15 parts by weight of furfurol extract having a viscosity of 23 cSt at 100 ° are placed in the mixer. C, and 20 parts by weight of used rubber tires with an unbroken polyamide cord.

The contents of the stirrer are heated to 310 ° C with vigorous stirring of the liquid, circulating it by means of a pump for 6 hours.

The product solution containing the decomposed rubber is then blown for 4 hours with superheated steam at 330 ° C and 2% by weight of oil boiling at 185-428 ° C is removed. The solution of decomposed rubber and asphalt thus obtained is pumped into an oxidizer, where it is oxidized at 260 ° C for 16 hours with compressed air to give the final product.

Light oil is used as fuel and tire bead reinforcements are recovered as steel scrap.

The resulting asphalt mixture has the following properties: - penetration at 25 ° C, load 100 g, 5 sec, mm / 10 69 - kinematic viscosity at 135 ° C cSt 710 - softening point according to the ring-and-ball method, ° C 52 - breaking point, according to Frash, ° C -13 - flash point, according to Marcuson, ° C 273 - elongation at 25 ° C, cm> 100 - Holmes index -3.2 - penetration index 15/25 ° C 0.33 - adhesion to basalt,% 100 - "- granite,% 80 -" - lime,% 100 gravel,% 100

Asphalt products are used in the manufacture of asphalt concrete with the following composition: - asphalt product, 6% by weight - basalt gravel, 73% by weight - pit sand, - "- 15 - lime dust, -" - 6 This asphalt concrete has the following properties (determined according to the Marshall method ): 66892 - free space,% 1,9 - strength, kp 998 - deformation, mm 4,5 - water absorption,% 1 - compressive strength at 20 ° C, kp / cm2 60,1 - compressive strength after impregnation with water, kp / cm 52.2 - water resistance index 0.9

Example VII;

500 kg of distillation asphalt with a penetration of 310 mm / 10 at 25 ° C and 500 kg of used car tires broken into pieces of about 50 mm are placed in the mixer.

The contents of the stirrer are heated to 320 ° C and the mixture is stirred at this temperature for 4 hours, after which superheated steam is blown in for 4 hours at 360 ° C, distilling off 6% by weight of oil, based on the total charge.

The contents of the mixer are filtered to remove pads and metal bars.

500 kg of the solution obtained are mixed at 150 ° C with 500 kg of oxidized crude oil asphalt having a penetration of 24 mm / 10 at 25 ° C and containing 3.1% by weight of paraffin.

An asphalt composition is obtained which has the following properties: - penetration, 25 ° C, 5 sec, 100 g, mm / 10 58 - penetration, 5 ° C, 5 sec, 100 g, mm / 10 8 - elongation, at 25 ° C 100 - kinematic viscosity at 135 ° C, cSt 990 - thin film volatility,% 0.1 - Holmes index 3,4 - penetration index -0.2 - adhesion to basalt,% 100 - "- granite,% 80 - "- limestone,% 100 -" - gravel,% 90

A cast mixture is prepared with the following composition: - asphalt product,% 8 - basalt gravel,% 60 - pit sand,% 13 - lime dust,% 19 66892 7

Example VIII:

300 kg of an extract containing 61% by weight of aromatic hydrocarbons obtained from crude oil by vacuum distillation with furfural and having a viscosity of 8.9 cSt at 100 ° C are placed in a mixer and the mixture is heated to 300 ° C. While stirring the contents of the mixer and maintaining the temperature at 300 ° C, 700 kg of granular rubber rings from which the metal parts have been previously removed are gradually added. When the addition is complete, the contents of the reactor are further stirred for 4 hours.

600 kg of the solution thus obtained with rings broken up in the extract are mixed with 400 kg of distillation asphalt, and the mixture is oxidized with compressed air at 250 ° C for 30 hours.

An asphalt composition with a penetration of 195 mm / 10 is obtained at a temperature of 25 ° C.

Example IX;

900 kg of distillation asphalt with a penetration of 100 mm / 10 at 25 ° C are placed in the mixer and heated to 280 ° C for 1 hour. Then 10 kg of granules made from used rings, up to 1 mm in size, with a polyamide cord are added portionwise and the mixture is stirred. 1.5 hours at a temperature of 280 ° C. The solution obtained is oxidized with compressed air for 28 hours at 200 ° C to give a final product having the following characteristics: penetration, pressure 100 g, 5 sec, temperature 25 ° C, mm / 10 40 15 ° C, 16 - kinematic viscosity, 135 ° C, cSt 950 - softening point, ring-and-ball method, ° C 53 - breaking point, according to Fresh, ° C -12 - flash point, according to Marcuson, ° C 286 - elongation, 25 ° C, cm 66 - volatility as a thin layer,% 0.4.

Claims (2)

66892 A process for preparing an asphalt composition for road surfaces based on asphalt and containing rubber or rubber waste which has been thermally treated and homogenized in the presence of hydrocarbons, characterized in that 1-80% by weight of rubber, rubber waste, used rubber products such as worn rubber tires are heated and decomposing in a medium containing petroleum bitumen and / or an extract of selective solvents used in the refining of oils and / or heavy oils and / or heavy coal tar products obtained from the cracking of petroleum products, at a temperature of 240 to 380 ° C, the products obtained are distilled, preferably under reduced pressure, and / or oxidized with compressed air at 200-320 ° C, and to this mixture is added an amount of petroleum bitumen containing less than 6% by weight of paraffins and / or natural asphalt that the amount of treated rubber in the finished asphalt composition will be 1-50% by weight. %. 2. A process for preparing an asphalt composition for road surfaces based on asphalt and containing rubber or rubber waste which has been thermally treated and homogenized in the presence of hydrocarbons, characterized in that 1-50% by weight of rubber, rubber waste, used rubber products, e.g. worn rubber tires, heating and decomposing 99-50% by weight of petroleum bitumen containing less than 6% by weight of paraffins and / or natural asphalt, at a temperature of 240-380 ° C, and that the resulting mixture is distilled, preferably under reduced pressure, or steam distilled, and / or oxidized with compressed air at a temperature of 200-320 ° C.