JPS58223685A - Non-static ammonium nitrate oil explosive - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a non-chargeable ammonium nitrate explosive.

Ammonium nitrate explosives can be poured directly into the borehole of the object to be destroyed or loaded using a loading machine using compressed air, during which the particles of ammonium nitrate explosive are sent at high speed through the loading hose and borehole. As a result, collision friction occurs and static electricity is generated.

This static electricity builds up on the loading hose, borehole, loading machine, and ammonium nitrate explosive particles. Such accumulated charges pose a major safety problem because if they are discharged all at once, there is a risk of causing the electric detonator to explode.

As a method for preventing the accumulation of static electricity, there is a known method of using a conductive container or a charging hose, but this method is not sufficiently effective in completely preventing charging of ammonium nitrate explosive particles.

The present inventors have learned about the ammonium nitrate explosive itself, its transportation,
As a result of extensive research in order to create properties that generate less static electricity during use and quickly discharge generated static electricity, we found that when ammonium nitrate oil explosives contain a specific compound, the ammonium nitrate oil has extremely low static charge. The present invention was completed by learning that oil-based explosives can be obtained.

That is, the purpose of the present invention is to provide an ammonium nitrate explosive which has great industrial value.The gist of the present invention is to add an ester obtained from polymethylolankane and higher fatty acids to an ammonium nitrate explosive. This is a non-chargeable ammonium nitrate ammunition.

The present invention will be explained in detail below.

The ammonium nitrate explosive used in the present invention consists of granular, particularly porous granular ammonium nitrate, fuel oil of about 61st diameter,
For example, heavy oil, light oil, kerosene, liquid hydrocarbons, etc.
Mineral oils, animal oils such as whale oil, vegetable oils such as seed oils,
Alternatively, it may be mixed with coal tar, etc. The ester obtained from polymethylolalkane and higher fatty acid includes a lower alkane having multiple methylol groups and a carbon number of 6 to . Examples include complete esters or partial esters of 2.2 with higher fatty acids.

Typical examples of polymethylolalkanes include trimethylolethane, trimethylolpropane, and tetramethylolmethane (pentaerythritol).

As a reminder, representative examples of higher fatty acids include saturated fatty acids such as heptanoic acid, octanoic acid, decanoic acid, dodecanoic acid, hexadecanoic acid, and octadecanoic acid, and unsaturated fatty acids such as octadecenoic acid, octadecadienoic acid, and octadecatorienoic acid. Examples include saturated fatty acids.

Esters obtained from such polymethylolalkanes and higher fatty acids are available, for example, from Nippon Oil & Fats ■, under the trade name [
Unistar JH-,? ,? It is also commercially available as GR1H-3/CoR, etc., and these can also be suitably used.

The blending amount of the ester obtained from the polymethylolalkane and higher fatty acid is 0.00 parts by weight of the ammonium nitrate explosive! r~/parts by weight, preferably 0.02-0
．． The amount is about 3 parts by weight. If the blended layer is too small, the antistatic effect cannot be expected. On the other hand, if it is used too much, no particular effect can be expected.

The method of blending the above-mentioned ester into the ammonium nitrate oil explosive is not particularly limited, and for example, a method of adding the above-mentioned ester to granular ammonium nitrate and then adding fuel oil, or a method of mixing the above-mentioned ester and fuel oil and adding the mixture. Alternatively, any method of adding the above ester to an ammonium nitrate explosive to which fuel oil has been added may be used.

The non-chargeable ammonium nitrate explosive of the present invention can also contain various known anti-caking agents.

For example, a fatty acid having a carbon number of t to 0, an aliphatic amine, a fatty acid amide, a fatty acid metal salt, a mixture thereof, a mixture of a fatty acid and an aliphatic amine are heat-treated at a temperature of about 70 to Iol. Anti-caking agents such as anti-caking products are preferably used, and the inclusion of these anti-caking agents improves the caking property and further improves the antistatic effect.

When using an anti-caking agent, non-static ammonium nitrate explosive i
It is preferable to use 0.0 to 0 parts by weight, preferably about 0.03 to 005 parts by weight.

The non-static ammonium nitrate explosive of the present invention has excellent antistatic effects and improved anti-caking properties compared to the above-mentioned ammonium nitrate explosive that does not contain ester, and therefore has great industrial value. .

EXAMPLES The present invention will be specifically explained below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof.

In addition, "parts" in the examples indicate "parts by weight."

In addition, the charging property is determined by having a hole for measuring electric field strength of 6θ φ on the bottom, length/width 20wn, width 100wg.

A gutter made by pasting a polyethylene sheet on a sowan-deep tin gutter. It is fixed at an inclination of r0, and the ammonium nitrate oil explosive 10θor to be tested is supplied from the top at a rate of 33 f/sec and dropped, and the electric field strength is measured using a rotating sector type electric field strength measuring device, and from the peak value. The determined charge density (C/Cr1) is shown. The temperature during measurement is g~
l0C1 humidity is 410-g! I was in charge of f.

Consolidation strength is determined by measuring the test ammonium nitrate explosive at 7θ φ x 100m.
10k when packed in a PVC cylinder of m size! Apply a load of I, cover with a polyethylene bag, and cycle the ammonium nitrate temperature from 20C to RiOC-+CoOC for about g hours to cause the ammonium nitrate to undergo a-time crystal transition. Removal and consolidation strength measuring device (manufactured by Toyo Baldwin,
What is the pressure (kg/m) at which the sample collapses due to Tensilon UTM Model Ill? The measured values are shown. The smaller the value of consolidation strength, the less consolidation.

Example 1 and Comparative Example/91 IO parts of granular ammonium nitrate, AO parts of No. 3% mixture) (manufactured by NOF ■, trademark, UNISTAR H-, 3
311R) were thoroughly mixed using a ribbon mixer to produce a non-chargeable ammonium nitrate oil explosive.

The chargeability and consolidation strength of this product were as shown in Table 1 below.

For comparison, the results obtained when the above-mentioned ester was not used and -) were also shown.

Table 1 Examples 1 to 13 9 parts of granular ammonium nitrate, AO parts of No. A non-charged ammonium nitrate explosive was produced by mixing the same esters.

The charging property and consolidation strength of the obtained ammonium nitrate oil explosive were as shown in Table 2 below.

For comparison, the results when using only the anti-caking agent (
Comparative Examples C to S) are also listed.

Claims (4)

[Claims] (1) A non-charged ammonium nitrate explosive prepared by blending an ester obtained from a polymethylol alkane and a higher fatty acid with an ammonium nitrate explosive. (2) The non-chargeable ammonium nitrate oil explosive according to claim (1), wherein the polymethylol alkane is trimethylol ethane, trimethylol propane or tetramethylol methane. (3) The non-chargeable ammonium nitrate oil explosive according to claim (1) or (2), wherein the higher fatty acid is a fatty acid having 6 to 2.2 carbon atoms. (4) The blending amount of the ester obtained from polymethylol alkane and higher fatty acid is 0.00 S/part by weight per 100 parts by weight of the ammonium nitrate explosive! '￥f, non-chargeable ammonium nitrate oil explosive according to claim 1, 2, or 3.