JPS5856583B2 - asphalt emulsion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to asphalt emulsions, and more particularly to asphalt emulsions having properties suitable for use as mixing asphalt emulsions.

Asphalt emulsion for mixing is used in a construction method in which aggregate and asphalt emulsion are mixed to form a mixture, and the mixture is spread on a road surface and compacted to obtain a pavement.

The performance required of the asphalt emulsion in this construction method is that it must exist at least as an emulsion until it is mixed with aggregate and spread on the road surface.

If the emulsion decomposes during this time, the workability of the mixture will be lost, causing problems such as the mixture not being able to be dropped from a dump truck or being spread evenly on the road surface.

That is, the emulsion for mixing is required to have such mechanical strength that it will not be destroyed even when mixed with aggregate in a pack mill, and the emulsion will not decompose for about 6 hours after mixing.

The mixture must also have a viscosity that will not separate the emulsion from the aggregate during transportation.

The present inventors conducted intensive studies to find an asphalt emulsion that has the performance of a stable asphalt emulsion suitable for such mixing, and found that higher aliphatic diamines and higher The present invention was achieved by discovering that a composition containing a fatty acid, a water-soluble polymer compound, a basic acid, and a water-soluble inorganic salt in a specific blending ratio has very good mixing stability.

That is, the present invention provides an aliphatic diamine (a) having 8 to 22 carbon atoms.
, water-soluble polymer compound (b), -basic acid←→, and water-soluble inorganic region yo@): (b): ('→: (-)-1: 0
．． 2-1°5: 0.05-1.5: Contains at a weight ratio of 0.3-6, and is a water-soluble inorganic! An aqueous solution (A) containing 1.2 to 8% by weight of (-==) 80 to 25% by weight and asphalt (B) containing a fatty acid having 8 to 22 carbon atoms (E) 20 to 75% by weight It is an emulsified mixture of aliphatic diamine (a) and fatty acid (aliphatic diamine (a)) containing 1:0.2 to 4.
It relates to an asphalt emulsion.

As in the present invention, a water-soluble inorganic salt is added to the emulsion at 1 or 2
The fact that a stable asphalt emulsion for mixing can be obtained when using a large amount of ~8% is a phenomenon that is difficult to imagine based on the common knowledge that water-soluble inorganic salts are used to destroy emulsions, but The stability of an asphalt emulsion under mixing differs from the stability when the emulsion is left standing, due to the phenomenon that water in the emulsion is absorbed into the aggregate, adsorption of the emulsifier on the surface of the aggregate,
It refers to stability that indicates resistance to emulsion destruction factors such as destruction due to mechanical shearing of the surface layer of emulsified grains, and therefore the above-mentioned formulation is necessary, which cannot be assumed based on conventional common sense regarding stability.

That is, it is not effective just to say that higher aliphatic diamines, higher fatty acids, water-soluble polymer compounds, -basic acids, and water-soluble inorganic salts are included, but it is not effective if the proportions of these are within the above range. It becomes effective for the first time.

Examples of the aliphatic diamine (a) having 8 to 22 carbon atoms used in the present invention include hardened beef tallow propylene diamine, beef tallow propylene diamine, behenyl propylene diamine, stearyl propylene diamine, octyl ethylene diamine, palmitylphuropylene diamine, and myristyl propylene diamine. , laurylpropylenediamine, octylpropylenediamine, stearylethylenediamine, palmitylethylenediamine, myristylethylenediamine, -
y U') /L/ethylenediamine, octylethylenediamine, stearyloxydipropylenediamine,
Palmityloxydipropylene diamine, millis-f-
/L/A water-soluble polymer compound in which oxydipropylene diamine, lauryloxydipropylene diamine, octyloxydipropylene diamine, etc. can be used (
As b), polyvinyl alcohol, gelatin, polyacrylamide, polyethylene glycol, methylcellulose, cationic starch, polyethyleneimine, etc. can be used, but polyvinyl alcohol is preferred.

The amount used is 0.2 to 1.5 times the weight of the above diamine (a), and preferably 0.2 to 2% based on the water-soluble mA).

Monobasic acids←→ include hydrochloric acid, acetic acid, nitric acid, perchloric acid,
Hydroxyacetic acid, monochloroacetic acid, etc. can be used.

The amount used is 0.05 to 1.5 based on the above diamine (a)
The weight is preferably 2 to 4 equivalents.

Examples of water-soluble inorganic salts include sodium chloride, calcilum chloride, magnesium chloride, potassium chloride, iron chloride, aluminum chloride, ammonium chloride, sodium nitrate, calcilum nitrate, magnesium nitrate, iron nitrate, aluminum nitrate, ammonium nitrate, potassium nitrate, rhodan. Potassium, rhodan soda, rotasocalium, etc. can be used.

The amount used is 0.3 to 6 times the weight of the above diamine (a), and 1.2 to 8 weight% based on the water-soluble mA).

The appropriate amount to be used is 2 to 4% by weight based on the aqueous solution (A), although it depends on the amount of the diamine @) used.

Fatty acids having 8 to 22 carbon atoms (as (1), hydrogenated beef tallow fatty acids, 1 beef tallow fatty acids, behenic acid, stearic acid, oleic acid, palmitic acid, myristic acid, lauric acid, and caprylic acid can be used).

This fatty acid (1) is used by being added and dissolved in asphalt, and the amount used is 0.2 to 4
It is preferably 1.6 to 2 equivalents by weight.

Asphalt in asphalt emulsion) (B) and emulsion (
Aqueous solution) Weight ratio with (A) is 20-75%: 80-2
5%, preferably 50-70%: 50-30%.

The penetration of the asphalt used should be 60 or higher, but 1
Generally, it is about 00 to 300.

When preparing the emulsion of the present invention, the temperature during emulsification is preferably asphalt 110 to 160°C1 emulsion (aqueous solution containing diamine, water-soluble polymer compound, water-soluble inorganic salt, and basic acid) 30 to 80°C Particularly preferred temperatures are 120 to 150°C for asphalt and 60 to 70'C for emulsion.

An asphalt emulsion can be produced by simultaneously passing this emulsion and asphalt through an emulsifier, such as a colloid mill.

Next, the present invention will be explained with reference to Examples.

All percentages in the examples mean percentages by weight.

Example 1 Hardened beef tallow propylene diamine 1.5%, polyvinyl alcohol (molecular weight 1700, degree of saponification 88%) 0.5%,
40 parts by weight of an emulsion at 60°C in which 1.5% of 60% nitric acid and calcium chloride were added in the amounts shown in Table 1 and dissolved in a transparent manner, and 1.5% of stearic acid was added and dissolved at 150°C.
An emulsion was prepared by passing 60 parts by weight of asphalt (penetration: 180-200) through a colloid mill.

Table 1 shows the properties of this emulsion and the mixing stability results of the emulsion in a pack mill mixing test.

However, the puncture mill mixing test is as shown below.

Air-dried aggregate of the following consistency in a pack mill of 100 kg kneading 10
Add 2% water and mix.

Add 9% asphalt emulsion to this and mix for 30 seconds.

The mixture is left in heaps at summer temperatures of 28-33°C.

After 6 hours, the mixture was spread with a scoop and the workability was judged; ○: The emulsion was not decomposed and the workability of the mixture was excellent.

* *△: The emulsion shows signs of decomposition, but the mixture is workable.

×: The emulsion has decomposed and the mixture has no workability.

From the particle size of the air-dried aggregate in Table 1, it can be seen that the amount of calcium chloride, which is a water-soluble inorganic salt, is effective in the range of 1.2 to 8%.

Example 2 Hardened beef tallow propylene diamine 1.0%, polyvinyl alcohol (molecular weight 1700, degree of saponification 88%) 0.5%,
40 parts by weight of an emulsion at 60°C containing 60% nitric acid i, o% and 3% of various water-soluble inorganic salts shown in Table 2 and asphalt at 150°C in which 1.0% stearic acid was added and dissolved. An emulsion was prepared by simultaneously passing 60 parts by weight (penetration: 180-200) through a colloid mill, and a pack mill mixing test was conducted.

The results are shown in Table 2.

It can be seen from Table 2 that most of the water-soluble inorganic salts are effective.

Example 3 Hardened beef tallow propylene diamine 1.0%, 60% nitric acid 1.
Asphalt at 150℃ (needle Parts by weight of 6Q (180,200) were simultaneously passed through a colloid mill to prepare an emulsion, and a pack mill mixing test was conducted.

The results are shown in Table 3.

It can be seen from Table 3 that it is necessary to use a water-soluble polymer.

However, if a large amount is used, the viscosity of the emulsion increases, resulting in poor workability and impractical use.

Example 4 Hardened beef tallow propylene diamine 1.0%, 60% nitric acid 1.
0%, polyvinyl alcohol (molecular weight 1700, degree of saponification 88%) 0.5% and calcium chloride 3.0%
40 parts by weight of an emulsion at 60°C using the same method and 60 parts by weight of asphalt (penetration 1.8O-200) at 150°C in which the fatty acids shown in Table 4 were added and dissolved were simultaneously passed through a colloid mill to form an emulsion. A pack mill mixing test was carried out.

The results are shown in Table 4.

It can be seen from Table 4 that it is necessary to use fatty acids.

Example 5 Polyvinyl alcohol (molecular weight 1700, saponification degree 88)
%) 0.5%, calcium chloride 3.0%, and various diamines shown in Table 5 and 60% nitric acid were added and dissolved 6
Prepare an emulsion by simultaneously passing 40 parts by weight of an emulsion at 0°C and 60 parts by weight of 150'C asphalt (penetration 180-200) in which various fatty acids shown in Table 5** have been added and dissolved through a colloid mill. Then, a pack mill mixing test was conducted.

The results are shown in Table 5.

However, the amount of 60% nitric acid used is the same as the amount of diamine.

Here, ``cyamine-1; hardened beef tallow propylene diamine diamine-
2; Beef tallow propylene diamine diamine-3, stearyl ethylene diamine diamine-
4; Stearyloxydipropylene diamine fatty acid-1
: Hydrogenated beef tallow fatty acid fatty acid -2; Beef tallow fatty acid fatty acid -3; Coconut fatty acid

Claims (1)

[Scope of Claims] 1. Aliphatic diamine having 8 to 22 carbon atoms (a), water-soluble polymer compound (b), -basic acid ←→, and water-soluble inorganic salt 0
→ (a): (b): ←→ :ni) -1: 0.2~1.
5: 0.05 to 1.5: 0.3 to 6 weight ratio, and an aqueous solution (A) containing 80 to 25% by weight and having a water-soluble inorganic content of 1.2 to 8% by weight. , C8-22 fatty acids (asphalt containing strength)
B) is an emulsified mixture of 20 to 75% by weight, containing aliphatic diamine (a) and fatty acid (weight ratio (a):(e) of 1:0.2 to
4, asphalt emulsion.