JPS5915353B2 - Method for producing colored asphalt composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a colored asphalt composition, and more particularly, to a mixture of a fatty oil and an alkylamide.
After adding red mud containing ~300% water and heating and stirring,
The present invention relates to a method for producing a five-color asphalt composition, in which the red mud particles are kneaded to form an oily slurry while raising the temperature, and this is mixed and stirred into heated and molten asphalt.

Red mud is a reddish-brown muddy extraction residue produced in large quantities in the aluminum industry when alumina is extracted by treating bauxite with an alkali solution, and its ten constituent components are shown in Table 1.

Table I (Example of Analysis of Red Mud Components) In addition to the alkali-insoluble iron oxide, quartz, etc. that exist in bauxite, red mud also contains alkali-ready soluble substances dissolved into the solution during alumina extraction. The main component is fine precipitates of sodium aluminum silicate, which are precipitated when the silicic acid content is fused with the alumina and sodium content in the liquid, and it has a moisture content of 200 to 300%. If used as is as a coloring material, a large amount of water must be removed, and its properties are poor in peel resistance, and strength decreases due to water immersion, and this tendency becomes more pronounced over time. Due to these drawbacks, it cannot be used as is.

Therefore, as a means of using this red mud as a coloring agent for asphalt, it is possible to bake it at a high temperature of 800 to 1200°C and use it after mechanically pulverizing it, or use it as an aqueous emulsion. However, since it is not very economical to do this, it is currently disposed of by land reclamation, ocean dumping, etc.

The present invention was developed in view of this point, and therefore, the purpose of the present invention is to use red mud containing about 200 to 300% water.
It is an object of the present invention to provide a method for producing a colored asphalt composition that has a large hiding power and good coloring by effectively utilizing the asphalt composition in its original state. Red mud containing approximately 200 to 300% water was added to the mixture, heated and stirred, and then kneaded with red mud particles while increasing the temperature to form an oily slurry, which was then poured into heated and melted asphalt. The mixture was mixed and stirred.

As mentioned above, the present invention is a method for producing a colored asphalt composition that uses red mud containing about 200 to 300 (!) water as a coloring agent for heated asphalt, and has a high hiding power and good coloring. , red mud containing about 200 to 300 (fl!) water is weakened by a hydrophilic activator to weaken the cohesive force, widen the interparticle gaps, allow fatty oil to seep through, separate water droplets, and make it lipophilic so that it can be easily heated in asphalt. It was made so that it could be dispersed into

That is, there is no hydrogen bond at the terminal and the structural formula (R-C-ZN<z
) (R is an alkyl group, Z is a methyl group or an ethyl group.

) about 200 to 300 in the alkylamide compound represented by
% water content was treated, and the alkylamide compound contained 1. It dissolves well in soluble hydrocarbons, plasticizers, fatty acids, animal and vegetable oils, and esters, and also dissolves in water.

2. It has electron-donating properties because it has an electron-donating carbonyl group, and it is thought to show affinity with electron acceptors such as alcohols, phenols, acids, and other hydrogen ion donors, and form a complex with red mud.

3. Thermal stability Stable at high temperatures, preventing deterioration of fatty oil due to heating during evaporation of water in red mud.

4. Chemical stability and physical properties It is stable in alkaline solutions of sodium aluminum silicate without being hydrolyzed by the water it contains.

It also improves mechanical dispersibility during kneading, etc. Because of these characteristics, it was possible to disperse red mud containing approximately 200 to 300% water into heated asphalt as described above.

The property range of the alkylamide compound that is effective in the present invention is shown in the table.

In addition, the alkylamide compound reduces the oil absorption of fatty oil, which is an auxiliary agent used for dispersion, and transfers water to the oil as water droplets, so that red mud can be made into an oily red mud slurry by the brushing method. The colored asphalt composition of the present invention is produced by mixing this with heated and molten asphalt while stirring and adjusting the composition in various ways depending on the consistency and colorability.

Next, the manufacturing method of the present invention will be described in detail based on the illustrated flowchart. 1 to 20% (wt.
) is represented by the structural formula (R-C-N0H3) and 11CH3
Add Alkylamide B and mix well to obtain Mixture C.

Red mud D containing about 200 to 300% water and mixture C were weighed out at a ratio of 90 to 60:10 to 40 parts by weight, and heated at 100°C.
After mixing and stirring while heating for 1 hour, the red mud particles are crushed using a roll mill or a ball mill.

During this kneading, the temperature is gradually raised to 110 to 150°C to evaporate the water that has migrated to the mixed oil, producing a reddish-brown slurry E. Next, 5 to 65 parts of the slurry E is added to 95 to 35 parts of asphalt F heated and melted at 150 to 160°C, and the mixture is well mixed and stirred until the mixture is uniformly mixed to form colored asphalt composition G. is manufactured.

Next, one embodiment of the present invention will be described.

157.5 parts of fatty acid distillation residue (same parts by weight and below),
Red mud 318 is mixed with 7.5 parts of unsaturated fatty acid dimethylamine, and 165 parts of this mixture contains 25001) of water.
After mixing and stirring while heating at 100°C,
The red mud particles were crushed using a roll mill.

During this kneading, the temperature was gradually raised to 130° C. to evaporate the moisture transferred to the distillation residue of the fatty acid.

Asphalt 8 with a penetration degree of 100 (25°C) heated and melted at 150°C was added to 15 parts of the reddish brown slurry thus obtained.
5 parts were mixed and stirred well to obtain a colored asphalt composition, in other words, a reddish-brown asphalt slurry. Next, examples of properties are shown in a table for a total of three types: asphalt (penetration 25 red C40-200) and two types with different mixing ratios of reddish-brown slurry E to asphalt.

However, the above A is a mixture of asphalt FlOO parts and 4 parts of a reddish brown slurry E, and the above B is a mixture of 85 parts of asphalt F and 5 parts of a reddish brown slurry El, in other words, the one obtained in the above example. shows.

The reddish-brown slurry E obtained as described above contains limestone,
Like igneous rock, slaked lime, etc., it can be used as a filler for asphalt.

In addition, the fatty oil and alkyl acid used to make the reddish-brown slurry E become suspended with the water in the red mud, and due to the small foaming state and easy kneading, the red mud becomes particles of 5 μm or less, which are dispersed. As a result, it becomes a reddish-brown slurry, so it is possible to produce a colored asphalt composition that has a large hiding power and a good coloring state. In addition, since fatty oil is present in the colored asphalt composition as described above, the basic substances contained in the red mud do not turn into plones even in heated asphalt, and as a result, it is possible to prevent the asphalt from becoming plones. This has remarkable effects such as preventing the asphalt that has been laid from becoming hard.

Since the method for producing the colored asphalt composition of the present invention is configured as described above, as is clear from the above explanation, approximately 20 to 3
By effectively utilizing the red mud containing 0.00 (fl) of water as it is, it has a remarkable effect of easily producing a colored asphalt composition with great hiding power and a clear reddish-brown color.

[Brief explanation of the drawing]

The drawing is a flowchart showing the manufacturing method of the present invention. A: Mixed oil, B: Alkylamide, C: Mixture, D: Red mud, E:
... Reddish brown slurry, F ... Asphalt, G ... Colored asphalt composition.

Claims (1)

[Claims] 1 Add about 20% to a mixture of fatty oil and alkylamide.
After adding red mud containing 0 to 300% water and heating and stirring, kneading the red mud particles while increasing the temperature to form an oily slurry, and mixing and stirring this into heated and molten asphalt. A method for producing a colored asphalt composition characterized by: