JPS5918431B2 - Asphalt emulsion type dustproof agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an asphalt emulsion type dustproofing agent.

When storing, transporting, and handling powdered raw materials, intermediate products, and products in industrial industries such as steel manufacturing, smelting, gas production, and carbon production, dust tends to scatter, causing problems of contamination of workers and the surrounding environment. . Conventional sheeting and water sprinkling cannot sufficiently solve this problem, so recently dustproofing agents based on surfactants, tar emulsions, and asphalt emulsions have been developed. However, these methods have drawbacks such as evaporation of water too quickly, formation of dust after evaporation of water is accelerated, a large number of sprayings are required, and it is difficult to form a uniform film. The present invention was completed through repeated research in order to eliminate the above-mentioned drawbacks, and is an inexpensive dustproofing agent that is excellent in permeability to powder, formation of a strong film after spraying, and weather resistance. The present invention contains at least one alkylbenzene sulfonate and at least one inorganic base, or at least one alkyl-substituted alkylene diamine, at least one inorganic acid, and at least one inorganic salt. This is an asphalt emulsion-type dustproofing agent using water as a dispersion medium containing one kind of asphalt.
3 to 9 parts by weight of polyoxyethylene alkylphenol ether with an HLB number of 12 to 15 per part by weight
One type selected from the group of compounds consisting of diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono n-propyl ether, diethylene glycol mono n-butyl ether, saturated aliphatic monohydric alcohol having 1 to 5 carbon atoms, cyclohexyl alcohol, and ethylene glycol. or an asphalt emulsion-type dustproofing agent characterized by containing two or more kinds at a ratio of 0.7 to 2 parts by weight.

That is, the dustproofing agent of the present invention is made into an emulsion by stably suspending asphalt in water, and since water is used for the purpose of suspending asphalt, the ratio of asphalt to water is determined according to the standard. The invention does not need to be specified.

However, from the perspective of transportation, it is economical to increase the asphalt content as much as possible, so it is preferable to use a relatively small amount of water. The amount of water in the dustproofing agent of the present invention is approximately 3
About 0 to 60wt%, while asphalt content is about 50w
The amount is preferably t% or more, and for on-site use, it is sufficient to further add water to dilute and spray. As the asphalt component, preferably used is a residue obtained after vacuum distillation of crude oil, that is, a straight type, or deasphalt obtained by deasphalting this with a light hydrocarbon such as propane. To emulsify asphalt in water, at least one known alkylbenzene sulfonate and an inorganic base such as NaOH, KOH, M
9(0H)2, Ca(0H)2, etc., or at least one alkyl-substituted alkylene diamine and an inorganic acid such as HCI, H2SO4, H3PO4.
, HNO3, etc., are added to the system consisting of asphalt and water, and stirred at high speed. Each component is approximately 0.1 to approximately 1w based on the total amount of asphalt and water.
Just add t%. When using the alkylbenzene sulfonate, the pH of the emulsion should be adjusted to 10 to 11.
It is effective for emulsion stabilization to stabilize the pH.
It is necessary to add the above-mentioned non-isolated base for adjustment. In addition, when using an alkyl-substituted alkylene diamine, P
Controlling H3 to H4 is effective for emulsion stabilization, and the above-mentioned inorganic acids are used. In particular, when the diamine is used, the resulting emulsion remains in an emulsified state for several days, but gradually phase separates thereafter. Inorganic salts such as CaCl2, MgCl2, Kcl, Ca as stability aids
It is effective to mix a small amount of two or more types of inorganic electrolyte components such as CO3, MgCO3, K2CO3, etc. In the present invention, polyoxyethylene represented by the general formula (where R1 is an alkyl group having 8 to 12 carbon atoms, R2 is hydrogen, is an alkyl group having 1 to 2 carbon atoms, and n is an integer in the range of 6 to 12) Among anolekyl phenol ether compounds, HLB number is 12 or more
A compound with an asphalt content of 10 is necessary from the viewpoint of improving emulsion stability and forming a dust-proof film.
It is blended in an amount of 3 to 9 parts by weight per 0 parts by weight.

Specific examples include polyoxyethylene nonyl phenol ether, polyoxyethylene octyl phenol ether, polyoxyethylene decyl phenol ether, polyoxyethylene undecyl phenol ether, and polyoxydodecyl phenol ether. If the amount is too large, the emulsion stability will decrease, and if the amount is too small, the dustproof performance will not be exhibited. The range of HLB number is determined from both emulsion stability and dust scattering prevention properties. That is, the polyoxyethylene alkyl phenol ether used in the present invention has an HLB number in the range of 12 to 15, and using a polyoxyethylene alkyl phenol ether that falls within this range forms a stable emulsion and is free from dust. It becomes possible to obtain a dustproof agent with excellent anti-scattering properties. If the HLB number is less than 12 or greater than 15, a dustproofing agent that satisfies either or both of the above performances cannot be obtained. Furthermore, in the present invention, at least one compound selected from the group consisting of diethylene glycol monoalkyl ether, foamed aliphatic monohydric alcohol having 1 to 5 carbon atoms, cyclohexyl alcohol, and ethylene glycol is used to improve dust prevention and emulsion stability. 1 type or 1
The amount of seeds or more is 0.7 to 100 parts by weight of asphalt.
2 parts by weight is blended.

More specifically, the alkyl group as the diethylene glycol monoalkyl ether compound is methyl, ethyl, n-
It is either propyl, n-butyl, or n-amyl.
Further, among saturated aliphatic monohydric alcohols, alcohols having 6 or more carbon atoms lack emulsion stability. To produce the dustproofing agent of the present invention, at least one alkylbenzene sulfonate, at least one inorganic base, or at least one alkyl-substituted alkylene diamine, at least one inorganic acid, and an inorganic salt are prepared in advance. A water-asphalt emulsion is prepared using at least one of the two, and aqueous solutions of polyoxyethylene alkyl phenol ether, diethylene glycol monoalkyl ether, etc. are prepared separately, and these are combined and stirred at high speed.

The dustproofing agent of the present invention may be used as it is, or may be further diluted with water before use, and then sprayed onto a pile of powder using a spray gun or the like.

According to test results on piles of coal powder and copper ore tailings,
When dust-proofing agent is evenly distributed so that the amount of asphalt is about 10 to 20 f1 per 1 m2, the wind speed is 20 m/Sec.
It can effectively prevent scattering even when exposed to wind. The dustproofing agent of the present invention has good surface wettability of powder and grains, penetrates deeply into the inside of the pile, forms a uniform film, and has strong bonds between particles, and also does not scatter and wash away during wind and rain, and can be stored for a long time. The above performance is maintained stably even during the middle of the day.

The present invention will be explained by way of examples.

Below, the performance test method conducted in the examples will be first described. (1) Dust scattering prevention test This test method is a test method for evaluating dust resistance.

Coal powder (particle size 1.2mm or less) 1009 with a diameter of about 10?
A dustproof agent solution diluted 100 times with water is made into a cone shape.
Spray 3' (309 as dustproof agent) per square meter using a spray gun or other atomizer. After spraying, leave it indoors for 24 hours.
A blower blows air at a speed of 20 m/sec onto the sample for 2 minutes, and the state of dust scattering is observed. [Evaluation] ○: Approximately 1CCf in diameter! IOI) The shape of the pile of coal powder deposited in a conical shape does not change at all even when a wind of 20 m/sec is applied for 2 minutes, and no scattering of coal powder is observed.

X: The film of the dustproof agent breaks and the pile of coal powder collapses, and at the same time the coal powder scatters.

(2) Wet test This is a test method for evaluating the wettability of a dustproof agent to powder.

Dilute the dustproofing agent 100 times (by volume) with water and add 50
Take 400m1 in a 0m1 beaker. Oil coke (particle size: 1.2 m77! or less) is dropped onto this, and the time until the oil coke disappears from the surface is measured. [Evaluation] ○: All oil coke particles settle to the bottom of the beaker in 5 seconds or less.

X: No sedimentation after 48 hours or more.

(3) Weather resistance test This is a test method for evaluating the weather resistance of a dustproof coating.

A liquid obtained by diluting a dustproof agent 100 times with water was added to copper ore tailings 2.
Spray 009 on a cone-shaped pile at 4' per square meter (409 as a dustproof agent). Leave this outside for a month,
Measure "changes in external shape" and "film strength". [Evaluation] ○: Approximately 10 in diameter? The shape of the waste slag powder deposited in a conical shape did not change even if it was left outdoors for 30 days.

x: The conical shape collapses and becomes flat and crushed.

Film strength measurement method Measured using an instrument used to measure soil hardness (Yamanaka soil hardness meter [manufactured by Tohoku Shikenki Co., Ltd.]).

Press this cone against the surface of the accumulated waste powder and measure the pressure that causes film failure.

(4) Measurement of moisture content over time This is a test method for evaluating the sealing properties of dustproof coatings.

Coal powder sufficiently moistened with water (particle size 1.2 mm or less) 1
009 in a 500ml beaker and add dustproofing agent solution (
Spray dustproofing agent: water (1:99 volume ratio) and leave it indoors. After 5, 10, 15, 20, 25 days, measure the weight and calculate the moisture content.

The moisture content is calculated using the following formula. (5) Emulsion stability test This is a test method for evaluating the emulsion stability of dustproofing agents.

250 ml of emulsion was put into a 300 d cylinder, the cylinder was tightly stoppered, and the cylinder was left to stand for 5 days, and then the state of separation of the emulsion was observed.

〔evaluation〕

○: Even after standing for 5 days, only the emulsion layer remained and no separation of the aqueous phase and asphalt layer was observed.

×: Separation of the asphalt layer or water layer was observed at 10 ml or more.

Example 1 Straight asphalt (penetration 8C-100) 65w
t% and sodium dodecylbenzenesulfonate 0.5wt%
, 0.1 wt% of caustic soda and 34.4 wt% of water were stirred at high speed to make an asphalt emulsion, and the HLB number was 12.
．． 3 polyoxyethylene nonyl phenol ether 4
An aqueous solution containing 10 wt % of diethylene glycol-n-butyl ether and water as the balance was prepared, and 90 wt % of the asphalt emulsion and 10 wt % of the aqueous solution were mixed and stirred to prepare a dustproofing agent.

Example 2 In place of the asphalt emulsion used in Example 1, 0.7 wt% of N-stearyl-1,3-diaminopropane and 0% of hydrochloric acid were used.
．． An asphalt emulsion was prepared containing 3 wt% calcium chloride, 0.1 wt% calcium chloride, 65 wt% asphalt, and 33.9 wt% water.

This was added to the aqueous solution used in Example 1 at a ratio of 90:10 (weight ratio).
The mixture was mixed and stirred to create a dustproof agent. These dustproofing agents were sprinkled on coal powder under the above test conditions and tested for dust scattering prevention properties, wettability, and weather resistance (film strength, external shape change).

The results were as shown in Table 1. At the time of this test, a similar comparative test was conducted using commercially available emulsion-type dustproofing agents A to E, and the results are shown in Comparative Examples 1 to 5.

The ingredients of each commercial product are as follows. It is clear from Table 1 that the dustproofing agent of the present invention forms a strong film.

In addition, an asphalt emulsion obtained using the same ingredients and method as in Example 2 without using calcium chloride showed a phenomenon in which part of the asphalt component separated from the aqueous phase after being left indoors for 10 days. .

Example 3 40 wt% polyoxyethylene nonylphenol ether with HLB number 12.3, alcohol (shown in Table 2) 1
Create a solution consisting of 0 wt% and water 50 wtf:I,
10 parts by weight of this solution and 90 parts by weight of the asphalt emulsion shown in Example 1 were mixed and stirred to prepare a dustproof agent.

The obtained dustproof agent was subjected to emulsion stability and dust scattering prevention tests, and the results shown in Table 2 were obtained. It is clear that monohydric alcohols with low carbon numbers, cyclohexyl alcohol and ethylene glycol are effective in maintaining both performances.

Example 4 The asphalt emulsion used in Example 1, polyoxyethylene nonyl phenyl ether (HLB number 13.3), and diethylene glycol mono-n-butyl ether were mixed to obtain a dustproof agent.

Table 3 shows the dustproof agent composition and performance test results. Example 5 Polyoxyethylene nonyl phenol ether (HLB
l5. O) 40wt%, diethylene glycol mono-n
-A solution consisting of 10 wt% of butyl ether and 50 wt% of water was prepared and mixed with the asphalt emulsion used in Example 1 to obtain a dustproofing agent.

The composition and performance are shown in Table 4. HLBl5. used in Example 6 and Comparative Example Example 5. 4 polyoxyethylene nonyl phenol ether and polyoxyethylene octyl phenol ether with different HLB numbers were used instead of polyoxyethylene nonyl phenol ether in O.
A dustproofing agent was prepared by using 0 wt% and using the same method as in Example 5 with other ingredients and methods.

The emulsion stability and dust scattering prevention properties of the obtained dustproof agent were evaluated.
It was measured by the method described above. The results are shown in Table 5. As is clear from Table 5, even polyoxyethylene nonyl or octylphenol ether has an HLB number of 1.
Dust-proofing agents using less than 1 or more than 16 are not preferred because either emulsion stability or dust scattering prevention properties are poor.

[Brief explanation of drawings]

Figure 1 shows the sealing performance of the dustproof coating over time.

Claims (1)

[Claims] 1 Contains at least one alkylbenzene sulfonate and at least one inorganic base, or contains at least one alkyl-substituted alkylene diamine, at least one inorganic acid, and at least one inorganic salt An asphalt emulsion-type dustproofing agent using water as a dispersion medium, which contains (a) 3 to 9 parts by weight of polyoxyethylene alkylphenol ether having an HLB number of 12 to 15, and ( b) Diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-propyl ether, diethylene glycol mono-n-butyl ether, saturated aliphatic monohydric alcohol having 1 to 5 carbon atoms,
An asphalt emulsion-type dustproofing agent characterized in that it contains one or more compounds selected from the group of compounds consisting of cyclohexyl alcohol and ethylene glycol in a proportion of 0.7 to 2 parts by weight.