JPS5912712B2 - Remeltable asphalt powder and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remeltable asphalt powder, a method for producing the same, and its use, and in particular, the present invention relates to a remeltable asphalt powder, a method for producing the same, and a use thereof, and in particular, a powder that exhibits a dry powder state with good fluidity at room temperature and can be remelted by heating at a temperature of about 100° C. or higher, for example. For example, fuel, fuel compounding materials, various binders, binder compounding materials, various waterproofing agents, waterproofing compounding materials, various paving materials, pavement compounding materials, various fillers, filler compounding materials, various reinforcements. This includes conventional application fields for asphalt, such as additives, reinforcing agent compound materials, various rubber compound materials, various vibration-resistant materials, vibration-proof compound compound materials, various paints, paint compound materials, electrical insulation materials, electrical insulation compound compound materials, and other asphalt materials. The present invention relates to an asphalt powder that has unique properties that make it extremely useful in a wide range of new and new fields of application, and that makes it extremely easy to handle, store, transport, etc., as well as its preparation and use.

More specifically, the present invention relates to a remeltable asphalt powder obtained by pulverizing a molten mixture containing strongly oxidized asphalts and olefin resins, 5, and its manufacturing method and utilization.

Various asphalts such as natural asphalt, straight asphalt, blown asphalt, and cutback asphalt are known and used in a wide range of fields, but asphalts are substances that inherently have high temperature sensitivity and strong caking properties. Therefore, it is extremely difficult to make it into a dry powder that exhibits free-flowing properties at room temperature without substantially losing its remeltability, and the reality is that there has been no example of this in the past.

15-Generally, when mechanically pulverizing a substance with a low softening point and caking property, no matter what method is adopted, frictional heat generation between the material to be pulverized and the crushing mechanism causes the pulverization to occur. Since softening or melting of the compound cannot be avoided, it is usually practically impossible to obtain the desired powder.

For pulverization of such substances, for example, freeze-grinding means can be employed, but in addition to the disadvantages in terms of means and equipment,
When the obtained powdered product returns to room temperature, it re-condenses or re-agglomerates to restore its original cohesive state and becomes a lump.
H5: The purpose of powdering is lost. This phenomenon becomes even more severe under heavy loads, for example during storage. For example, blown asphalt, which has the lowest temperature sensitivity among asphalts (penetration: 3033-25℃)
, 100θ, 5 seconds: Softening point: 105°C) When attempting to obtain blown asphalt powder by pulverizing a lumpy solid sample with a fixed... The blown asphalt that has been pulverized will coagulate and coagulate with each other again and become lumpy, making it impossible to achieve the purpose of pulverization.

In straight asphalt, which is more sensitive to temperature than blown asphalt, this tendency is even more severe, and mechanical pulverization cannot be performed at all.

On the other hand, so-called oil coke 1 produced by dry distillation carbonization of asphalt residue becomes a powder that is stable at room temperature, but this product has a change in the asphalt component composition, has therefore lost its temperature sensitivity, and cannot be heated and remelted. It cannot be made into a thing.

As mentioned above, the present inventors aimed to provide a powdered product of asphalts that does not substantially lose its remeltability and that is practically impossible to form into a powder that is stable at room temperature. I've been doing research.

As a result, a molten mixture obtained by blending asphalt with strong oxidation treatment, preferably air oxidation treatment in the presence of a catalyst, with an olefinic resin as an auxiliary agent under melting conditions, can be easily powdered at room temperature. can be oxidized to form a stable powder, and this powder can be oxidized by heating.
For example, remeltable asphalt powder that can be easily remelted by heating to about 100°C or higher and exhibits excellent powder fluidity in handling, storage, transportation, workability, etc. in the wide range of applications mentioned above. discovered that it has unique properties.

Therefore, an object of the present invention is to provide a remeltable asphalt powder that can maintain a stable powder state at room temperature, can be remelted by heating, and is useful in a wide range of applications. Another object of the present invention is to provide a manufacturing method that is industrially advantageous and can provide such remeltable asphalt powder at low cost.

The above objects and many other objects and advantages of the present invention will become more apparent from the following description.

The remeltable asphalt powder of the present invention can be obtained, for example, by subjecting asphalt to strong oxidation treatment in the presence of a catalyst, forming a molten mixture containing the obtained strongly oxidized asphalt and olefinic resin, and cooling the mixture. It can be manufactured by powdering.

The above-mentioned strong oxidation treatment may be carried out by bringing the raw material asphalt into contact with molecular oxygen, such as air, in the presence of an oxidation catalyst such as a metal oxide or metal salt, and under temperature conditions such that the raw material asphalt is in a liquid state. I can do it.

Molecular oxygen or a molecular oxygen-containing gas can be used, and examples include air, oxygen, and a mixture of oxygen and an inert gas. Further, examples of the above-mentioned oxidation catalyst include CuO, A
t2O3,, P2O5, Atct3, FeCl3・6H
Examples include metal oxides or metal salts such as 201At2(SO4)3. This oxidation treatment
The softening point of the strongly oxidized asphalt that is formed is approximately 10
It is preferable to carry out the reaction until the temperature increases to 0° C. or higher, and the reaction temperature and time can be appropriately selected and carried out according to this guideline. Through such strong oxidation treatment, a sufficient oxidation treatment that is difficult to achieve with simple air oxidation is carried out, and the dehydrogenation polycondensation reaction of asphalts proceeds, and a complex three-dimensional network structure formation reaction occurs. This is thought to result in an increase in the softening point.

However, this state is still unsatisfactory, and by forming a molten mixture of such strongly oxidized asphalt and olefin resin, the unique remeltable asphalt powder of the present invention can be obtained. . The molten mixture of strongly oxidized asphalt and olefinic resin that can be obtained as described above can be formed by any means that can mix them as uniformly as possible while they are in a molten state.

If desired, olefinic resins can be blended in the oxidation treatment step, and the oxidation treatment and formation of the molten mixture can be performed simultaneously. The formed molten mixture can be allowed to cool or actively cooled and crushed by suitable powdering means to give a powdered product of the desired particle size and, if desired, sieved. can. The powdering treatment means can be appropriately selected, and mechanical crushing means or grinding means can be employed if it is industrially advantageous. Powder particle size varies from fine powder to fine particles, coarse particles, and
It can be suitably selected from a range of granular and other forms and pulverized. Additionally, at any step such as the aforementioned oxidation treatment, molten mixture formation treatment, or after said mixture formation, organic or inorganic compounding materials may be added to serve as drying aids or combustion aids, bulking, filling, or other compounding materials in the end use. I can do it. Examples of such blended materials include sawdust, rice husk, straw, pulp, waste paper and cloth pulp, other cellulosic materials, coke, combustible materials such as coal, clay, kaolin, etc. Examples include bentonite, shirasu, volcanic ash, calcined building stone, sand, crushed stone, and other clay or mineral filling materials. In this case, examples of olefin resins to be used include ethylene polymers or copolymer resins, various other α-olefin polymers or copolymers, blends thereof, and others. Examples include mixtures with resins, and among these, it is preferable to use ethylene resins.

These olefin resins may be used in powder form, or shredded waste products such as molded product scraps of these resins may be used as well, which is advantageous from a cost standpoint. The blending amount of such olefin resins can be selected as appropriate, and for example, the blending amount can be up to about 50 parts by weight, preferably about 10 to about 40 parts by weight, per 100 parts by weight of the strongly oxidized asphalt. A blending amount of approximately 1.5 parts can be adopted. The remeltable asphalt powder of the present invention, which can be obtained as described above, can be advantageously used as powdered asphalt with excellent handling and workability in a wide range of fields of application.

For example, about 0.1mf! It can be pulverized into a fine powder of L or less and used as a fuel for a powder combustion furnace, or it can be mixed with heavy oil etc. and used as a fuel for an oil burner type injection combustion furnace. , in the form of coarse particles, granules, or aggregates thereof, or as combustible materials such as those listed above, various combustion improvers, and sulfur component scavengers such as calcium and magnesium hydroxides and oxides. With or without mixing with other compounding materials,
It can be heat-molded into any shape and used as a solid fuel, or it can be used as a blended fuel for briquettes and charcoal charcoal.

Furthermore, after mixing with wood chips etc., it can be molded under heat and pressure into the desired shape of a board or block to be used as a water-resistant board or block. Alternatively, it can be used as a water-resistant board or block. It can also be used for asphalt loop ink processing, which is simpler and faster than the conventional molten asphalt coating method, by spraying it between fabrics, etc. and then heating and pressing it with a thermal calendar.It can also be used for road paving, waterproof walls, etc. When carrying out construction work, it is mixed with the desired aggregates, heated and rolled, and has a much easier construction method and superior workability than the conventional melting or cutback asphalt methods. It can also be used for paving, waterproofing, etc. Furthermore, various binders, compounding agents thereof, various fillers, compounding agents thereof, various reinforcing agents, compounding agents thereof, compounding agents of various rubbers, anti-vibration agents for vehicles, compounding agents thereof, asphalt-based paints, etc. As compounding agents, electrical insulation materials, compounding agents thereof, etc.Furthermore, as combustion improvers for waste incinerators, soil conditioners for plant growth, soil conditioners for wetlands and soft ground, heat insulating agents, compounding agents thereof, etc. can also be used with excellent workability and ease of handling.

Hereinafter, several embodiments of the production of remeltable asphalt powder of the present invention will be illustrated in more detail with reference to Examples.

Example 1 35 parts by weight of At2(SO4) as a catalyst was added to 100 parts by weight of prune asphalt, and the mixture was stirred and heated at 230°C for 1 hour.

Here, the asphalt gradually increases its viscosity and becomes a viscous liquid.

5 parts by weight of polyethylene powder (softening point: 128°C) is added to this, and the mixture is melted and reacted for about 20 minutes.

This was cooled, coarsely crushed, and then pulverized using a fixed mass crusher to obtain asphalt powder with a minimum diameter of about 0.1 WIL.

Example 2 57 parts by weight of P2O as a catalyst was added to 100 parts by weight of straight asphalt, and the mixture was stirred and heated at 230 to 270°C for 2 hours.

Furthermore, polyethylene powder (softening point: 30 parts by weight, 128°C) is added to this.
) is added and melted well for 20 minutes, this asphalt material becomes a semi-solid substance with extremely high viscosity.

When this is cooled, coarsely crushed, and powdered as in Example 1, the minimum is about 0.17! T/! ! Asphalt powder of L diameter is obtained.

Claims (1)

[Scope of Claims] 1. Remeltable asphalt powder obtained by pulverizing a molten mixture containing strongly oxidized asphalt and olefin resins. 2 Remelting characterized by strongly oxidizing asphalt in the presence of a catalyst, forming a molten mixture containing the obtained strongly oxidized asphalt and olefin resins, cooling it, and then powdering it. Production method of asphalt powder.