JPH10139578A - Propellant for consolidation, consolidate propellant and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propellant for consolidation which can suppress increases in the initial combustion rate and the pressure and can increase the bulk density and compression strength, and to provide a consolidate propellant and its producing method. SOLUTION: This propellant for consolidation is produced by gluing the surface of a smokeless powder essentially comprising nitrocellulose with a surface glue. The consolidate propellant has 3 to 50MPa/cm<2> compression strength and 0.9 to 1.5g/cm<3> bulk density. The consolidate propellant is produced by compacting the propellant for consolidation while heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propellant for consolidation, a propellant for consolidation, and a method for producing the same, and more particularly, it is characterized in that the initial burning rate is suppressed and the bulk density and the compressive strength are large.

[0002]

2. Description of the Related Art As a conventionally known consolidating propellant and a method for producing the same, a propellant is impregnated with an organic solvent under heating, swelled, and then pressurized (hereinafter referred to as consolidating). Then, a method of removing an organic solvent in a drying step, a method of mixing a non-volatile binder solution in which polystyrene, polyvinyl alcohol, or the like is dissolved in an organic solvent with a propellant, and removing the organic solvent after consolidation, or a method of removing the organic solvent. A method is known in which a binder and a propellant are mixed at room temperature and then consolidated under heating (US Pat. No. 3,655,836).

[0003]

In the production method in which the propellant is impregnated with an organic solvent, it is difficult to control the impregnation of the propellant with the organic solvent, and the method using a non-volatile binder solution dissolved in the organic solvent is difficult. In addition, since the non-volatile binders are individually weighed and mixed in small amounts, there is a problem that the compression strength varies. Also, in the method described in U.S. Pat. No. 3,655,836, the propellant cannot be glued because the mixing of the non-volatile binder and the propellant is merely a normal solid-to-solid mixture. Therefore, there is no effect of suppressing the initial combustion speed, and there is a problem that the rising combustion speed is too fast to suppress the pressure rise. . An object of the present invention is to suppress an increase in initial combustion rate and pressure,
An object of the present invention is to provide a propellant for consolidation, a propellant for consolidate, and a method for producing the propellant, which can increase bulk density and compressive strength.

[0004]

Means for Solving the Problems The first invention of the present invention is:
This is a propellant for consolidation in which the surface of a smokeless explosive containing nitrocellulose as a main component is glued on the surface with a glue. A second invention is a consolidate propellant formed from the consolidate propellant of the first invention and having a bulk density of 0.9 to 1.5 g / cm ³ . The third invention has a compressive strength of 3 to 3 formed from the propellant for consolidation of the first invention.
A consolidate propellant with a pressure of 50 MPa / cm2. According to a fourth aspect of the present invention, the propellant for consolidation of the first aspect of the present invention is pressurized under heating to increase the bulk density to 0.9 to 1.5 g / c.
is a manufacturing method of consolidating propellant, characterized in that the m ^3.

[0005]

Embodiments of the present invention will be described below in detail. Examples of the smokeless explosive based on nitrocellulose used in the present invention include, for example, a single base propellant based on nitrocellulose, a double base propellant based on nitrocellulose and nitroglycerin, nitrocellulose and nitroglycerin. And a triple base propellant containing nitroguanidine as a main component. These propellants include other ingredients, such as stabilizers such as diphenylamine and ethyl centralite,
A plasticizer such as dibutyl phthalate or triacetin is contained in the propellant, and its shape includes a spherical shape, a round bar shape, a single-hole shape, and a seven-hole shape.

[0006] Examples of the coagulant used in the present invention include dinitrotoluene, camphor, triacetin, dibutyl phthalate, diethyl phthalate, ethyl centralite, and the like.
Diphenylamine, 2nitrodiphenylamine and the like. Among these, diphenylamine has a melting point of 50-7.
The temperature is 0 ° C., which is preferable because of having appropriate tackiness when consolidating. The amount of the coalescent used is 1 to 10% by weight, preferably 3 to 6% by weight, based on the smokeless powder.
And the amount is determined so as to have performance suitable for the application. When the amount is less than 1% by weight, the effect of surface glue is not so much obtained, and the effect as a binder for consolidation tends to be weak. Conversely, if it exceeds 10% by weight, the energy of the propellant tends to decrease.
Here, surface glue is a smokeless powder of general composition impregnated with a slow-burning substance from the surface, burning up to a certain thickness from the propellant surface at a speed slower than the burning speed of the original propellant Means to adjust.

The bulk density of a consolidate propellant obtained by pressing a consolidate propellant under heating is 0.9 to 1.0.
5 g / cm ^3, preferably 1.0~1.4g / cm ^3. When the bulk density is less than 0.9 g / cm ^{3, the} strength is not sufficient at the time of handling, and the bulk density is 1.5 g / cm ^3.
If it exceeds cm ³ , the propellant that forms the consolidate propellant is significantly deformed, and the combustion characteristics tend to change.

The compressive strength of the consolidate propellant obtained by compressing the consolidate propellant by heating is 3 to 50 megapascal (hereinafter abbreviated as MPa) / cm ² , preferably 5 to 30 MPa / cm ² . is there. Compressive strength is 3MPa /
If it is less than ² cm ^{2, the} strength is not sufficient at the time of handling, and if it is more than 50 MPa / cm ² , the breakdown of the consolidate propellant gradually progresses during combustion, and the ignition tends to vary. is there.

Next, a propellant for consolidation and a method for producing a propellant using the same will be described. It consists of a gluing step and a pressing step. First, the gluing step will be described. When the coagulant is a liquid or a solid having a melting point of 80 ° C. or less and a hydrophobic substance, the following method is usually used. First, smokeless powder is put into warm water at 40 to 90 ° C. and stirred. At this time, the weight of the smokeless powder is 5 to 40% by weight, preferably
-30% by weight. When the amount is less than 5% by weight, it is uneconomical. On the other hand, when the amount is more than 40% by weight, the agglutination of the smokeless powder is deteriorated, so that uniform surface glue tends not to be obtained. The coagulant is then added while stirring. At that time, the entire amount of the surface adhesive may be added at once, but it is usually preferable to add it in several parts. This is because dispensing gives a more evenly agglomerated smokeless powder.
Thereafter, water is removed by a usual method and dried.

[0010] When the components of the smokeless powder and the coalescent are soluble in warm water, for example, when nitroguanidine is contained in the components of the smokeless powder, the gluing can be performed in the following procedure. . That is, smokeless powder is put into the heated rotating body. Next, after dissolving the coagulant in a solvent capable of dissolving the coagulant such as a single solution of ethyl alcohol or a mixed solution of ethyl alcohol and water, the mixture is sprayed onto a smokeless powder. At that time, the ratio of the coagulant to the solvent is in the range of 10 to 200% by weight, preferably 30 to 60% by weight. When the amount is less than 10% by weight, the process of volatilizing the solvent after the coalescence takes a long time. On the other hand, when the amount is more than 200% by weight, the amount exceeds the saturated dissolution amount, and the adhesive tends to precipitate. In order to prevent the propellant from coalescing, it is preferable to carry out the spraying in several times and to evaporate the solvent by heating the rotating body. The temperature for heating the rotating body at this time is usually 50 to 9
5 ° C., and 75% for more efficient evaporation of the solvent.
It is preferable to carry out in the range of -95 ° C.

Next, the propellant pressurizing step will be described. After weighing the propellant for consolidation obtained in the gluing process, the propellant is pressed using a heated mold jig as shown in FIG. First, a consolidating propellant 4 is placed between the dice 1 and the ram 2 heated by the hot water or oil circulation path 3.
Insert The set temperature for heating the die 1 is usually 20 to
120 ° C. However, in the case of a solid coagulant at room temperature, it is desirable to set the temperature higher than the melting point by 10 ° C. or more. On the other hand, if the temperature exceeds 120 ° C., the risk of ignition increases, which is not preferable. Next, the consolidating propellant is compressed by the ram 2 so as to have the desired bulk density. At this time, the ring 5 is sandwiched between the die 1 and the ram 2 and the thickness of the ring is changed to control the bulk density of the consolidating propellant.
00 MPa, preferably 3 to 50 MPa.
The compression time is usually 3 to 600 seconds, preferably 5 to 180 seconds. The consolidate propellant after pressing has sufficient strength for handling immediately after being taken out of the heated molding jig, but is usually left at room temperature for one day to stabilize the surface of the grain propellant.

[0012]

Next, the present invention will be described in detail with reference to examples and comparative examples. The percentages and parts in each case are on a weight basis. The abbreviations in the table mean the following. NC: nitrocellulose (nitrogen content 13.2%) NG: nitroglycerin NQ: nitroguanidine DA: diphenylamine ECL: ethyl centralit DNT: dinitrotoluene TA: triacetin The bulk density measurement, compression strength test and shooting test are as follows. Was determined by the method described above.

(Measurement of Bulk Density) The value of bulk density is obtained by determining the volume of a consolidate propellant from the measurement of the dimensions of each part and dividing the weight by the volume. (Compression strength test) The compression strength is obtained by crushing both end faces of the consolidate propellant on a cylinder at a speed of 30 mm / min.
This is a value obtained by dividing the required pressure required to destroy the consolidate propellant by the area of the end face of the consolidate propellant. (Shooting test) The shooting test was performed with a gun length of 90 cm and a chamber volume of 20.
The test was carried out with a 0 cm ³ non-chemical diameter 30 mm gun. All tests were performed with a propellant charge of 60 g and two consolidated propellants of 30 g were loaded. The evaluation items were the initial velocity and the maximum cavity pressure. The initial speed is 1m from the muzzle and 3m
Was calculated from the transit time at the point. The maximum cavity pressure was measured with a piezo sensor.

Example 1 First, a gluing step was performed. First, nitrocellulose 99.
0%, containing 1.0% of diphenylamine.
94 parts of a 5 mm spherical smokeless powder is heated in 90 ° C. hot water 1000
Part. Thereafter, 5.0 parts of dinitrotoluene was added while being stirred in two portions. After stirring for about 1 hour, the propellant was dewatered and dried to obtain a propellant for consolidation. Next, a press-fitting step was performed using a heated mold jig shown in FIG. First, 30 g of the propellant for consolidate was charged into a die 1 having an inner cylinder diameter of 30 mm adjusted to 100 ° C. by oil circulation. Then, at a pressure of 10 MPa, 60 mm is applied so that the inner volume of the heating mold is 25 cm ^3.
Pressed for seconds. After taking out the formed consolidate propellant from the heated mold, it was left for one day. Using the obtained consolidate propellant, a bulk density measurement, a compressive strength test and a shooting test were performed. In addition, in the shooting test, the number of repetitions was five, and in each case, a stable value was obtained. Table 1 shows the composition and shape of the smokeless explosive as the raw material and the type of the coagulant. Table 2 shows the test results of the consolidate propellant.

[0015]

[Table 1] (Note) The amount of the coalescent agent in the table is the weight percent of the outer percentage relative to the smokeless powder.

[0016]

[Table 2] (Note) The unit of bulk density is (g / cm ³ ), the unit of compressive strength is (MPa / cm ² ), the unit of initial velocity is (m / s), and the unit of maximum cavity pressure is (MPa). / Cm ² )
It is. Each test result is an average value of five repetitions.

Example 2 As a smokeless powder, the composition was the same in place of a spherical powder having an average particle diameter of about 1.5 mm, and the outer diameter was 2.5 mm and the inner diameter was 0.5.
A propellant for consolidation was prepared in the same manner as in Example 1 except that a single-hole smokeless powder having a length of 3.5 mm and a drug length of 3.5 mm was used, and 5.0 parts of diphenylamine was used instead of 5.0 parts of dinitrotoluene. Obtained. Further, a consolidate propellant was obtained by using it according to Example 1. Using the obtained consolidate propellant, a bulk density measurement, a compressive strength test and a shooting test were performed. In addition, in the shooting test, the number of repetitions was five, and in each case, a stable value was obtained. Table 1 shows the composition and shape of the smokeless explosive as a raw material and the type of the coagulant, and Table 2 shows the test results of the consolidate propellant.
It was shown to.

Example 3 Instead of 94.0 parts of a spherical smokeless powder containing 99.0% of nitrocellulose and 1.0% of diphenylamine and having an average particle size of about 1.5 mm as a smokeless powder, nitrocellulose 5 was used.
Outer diameter 2.5 mm, inner diameter 0.5 m containing 9.0%, nitroglycerin 40.0%, ethyl centralite 1.0%
m, a 3.5 mm long single-hole smokeless explosive, and a consolidating fire according to Example 1 except that 5.0 parts of ethylcentralit was used instead of 5.0 parts of dinitrotoluene. I got the medicine. Example 1 using it
Consolidated propellants were obtained according to. Using the obtained consolidate propellant, a bulk density measurement, a compressive strength test and a shooting test were performed. In addition, in the shooting test, the number of repetitions was five, and in each case, a stable value was obtained.
Table 1 shows the composition and shape of the smokeless explosive as the raw material and the type of the coagulant. Table 2 shows the test results of the consolidate propellant.

EXAMPLE 4 Instead of 94.0 parts of a spherical smokeless powder having an average particle size of about 1.5 mm containing 99.0% of nitrocellulose and 1.0% of diphenylamine as a smokeless powder, nitrocellulose 2 was used instead.
7, containing 8.0%, 22.5% nitroglycerin, 48.0% nitroguanidine, 1.5% ethylcentralit, having an outer diameter of 3.0 mm, an inner diameter of 0.3 mm, and a drug length of 4.5 mm.
Use porous smokeless explosives and use dinitrotoluene 5.0
A propellant for consolidation was obtained in the same manner as in Example 1 except that 5.0 parts of ethylcentralit was used in place of the parts. Further, a consolidate propellant was obtained by using it according to Example 1. Using the obtained consolidate propellant, a bulk density measurement, a compressive strength test and a shooting test were performed. In the shooting test, the number of repetitions was five.
In each case, stable values were obtained. Table 1 shows the composition and shape of the smokeless explosive as the raw material and the type of the coagulant. Table 2 shows the test results of the consolidate propellant.

Comparative Example 1 The propellant for consolidation described in Example 1 was directly used as a propellant without being pressed, and the bulk density was measured and a shooting test was performed. The compressive strength was so small that it could not be measured. The other tests were performed with 5 repetitions, and all obtained stable values. Table 3 shows the composition and shape of the smokeless explosive used as the raw material and the type of the coagulant, and Table 4 shows the test results of the consolidate propellant. Although the initial velocity and the maximum cavity pressure are almost the same as those of the shooting test results of Example 1, the consolidate of Example 1 is not consolidated, and has a low bulk density and is difficult to handle due to low compressive strength. Inferior to propellants.

[0021]

[Table 3] (Note) The amount of the coalescent agent in the table is the weight percent of the outer percentage relative to the smokeless powder.

[0022]

[Table 4] (Note) The unit of bulk density is (g / cm ³ ), the unit of compressive strength is (MPa / cm ² ), the unit of initial velocity is (m / s), and the unit of maximum cavity pressure is (MPa). / Cm ² )
It is. Each test result is an average value of five repetitions.

Comparative Example 2 A single-hole smokeless explosive having an outer diameter of 2.5 mm, an inner diameter of 0.5 mm, and a drug length of 3.5 mm was mixed with 5.0 parts of triacetin.
A consolidate propellant was obtained by a compacting process according to Example 1 using a consolidate propellant that was simply mixed without performing the glue process. Using this, a bulk density measurement, a compressive strength test and a shooting test were performed. In addition, in the shooting test, the number of repetitions was five, and in each case, a stable value was obtained. Table 3 shows the composition and shape of the smokeless explosive used as the raw material and the type of the coagulant, and Table 4 shows the test results of the consolidate propellant. It was found that the maximum cavity pressure was increased by about 20 MPa as compared with Example 2 and was inferior to Example 2.

[0024]

First, it is possible to obtain a more suitable initial combustion performance, that is, a consolidate propellant that can suppress an increase in initial combustion speed and pressure by changing the type and blending ratio of the coagulant. Secondly, it has a compressive strength that provides appropriate mechanical strength and a sufficiently high bulk density, so that a consolidate propellant that can be used for a wide range of applications can be obtained. Third, since the coalesced propellant is used and the coalescent acts as a binder for consolidation, as in the conventional method, the smokeless powder and the non-volatile binder are weighed in small portions before consolidation. Since there is no need for mixing or mixing, a consolidate propellant having uniform properties without variation in compressive strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a heated molding jig for manufacturing a consolidate propellant by pressing a propellant for consolidate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Die 2 ... Ram 3 ... Circulation path of hot water or oil 4 ... Propellant for consolidation 5 ... Ring for volume adjustment

Claims (4)

[Claims] 1. A propellant for consolidate, wherein the surface of a smokeless explosive containing nitrocellulose as a main component is glued on the surface with a glue. 2. A bulk density formed from the consolidating propellant of claim 1 having a bulk density of 0.9 to 1.5 g / cm ^3.
Is a consolidating propellant. 3. A consolidate propellant formed from the consolidate propellant according to claim 1 and having a compressive strength of 3 to 50 MPa / cm ² . 4. The propellant for consolidation according to claim 1 is pressed under heating to have a bulk density of 0.9 to 1.5 g /.
A method for producing a consolidate propellant, wherein the propellant has a size of cm ³ .