High-volume-energy-density energetic grain for cutting and preparation method thereof
By adjusting the composition and particle size of the energy-containing material, a high volume energy density cutting energy-containing drug column was prepared, which solved the problem of insufficient energy density of the existing pyrotechnic agent column, and achieved a smaller size and more efficient cutting effect.
Patent Information
- Application Number
- CN202510495460.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2025-05-27
AI Technical Summary
The energy density per unit volume of the existing pyrotechnic agent for downhole cutting is low, resulting in a larger size of the cutting device, which increases the cost, and is not conducive to operation in field emergency environments.
By adjusting the composition and particle size of the energy-containing material, an energy-containing drug column for cutting with a high volume energy density is prepared. The specific components include 25-45 wt.% Al powder, 20-50 wt.% MnO2 powder, 20-50 wt.% PbO2 powder, 5-20 wt.% PTFE powder and 2-8 wt.% fluoroelastomer. Ultrasonic ball milling and cold pressing molding are used to improve the molding performance and energy density of the drug column.
It realizes a high volume energy density energy-containing drug column, has stable combustion process, good molding performance, good cutting and perforation effects, shortens the size of the cutting device, reduces the cost, and improves the convenience of operation.
Smart Images
Figure CN120040251A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an energetic drug column for cutting with high volume energy density and a preparation method thereof. Background Art
[0002] The energetic material is loaded into a semi-closed container with an open structure. The combustion reaction process generated by the energetic material after ignition can form a high-temperature reaction product, and the high-temperature product can be ejected from the opening to form a high-temperature jet. When the high-temperature jet hits the metal target, it can produce a certain penetration and cutting effect. Generally speaking, the higher the reaction temperature of the energetic material and the faster the combustion reaction speed, the better the cutting effect on the target. In the case of cutting operations in the field without external energy supply conditions, such as underground cutting and demolition operations, the combustion effect of energetic materials can be used to cut the target object.
[0003] Gao Qiang et al. from Northwest University (Gao Qiang. Pyrotechnic composition, process, device design and application for cutting oil and gas well pipes [D]. Xi'an: Northwest University, 2018.) developed a pyrotechnic composition for downhole cutting, which contains Al powder, Ni powder, Fe 2 O 3 , CuO, Cu 2 O and fluororubber, and carried out tubing cutting experiments deep underground, achieving the purpose of cutting the tubing. However, a large amount of pyrotechnics columns (the total charge mass of the columns reaches 2.38 kg and the total length reaches 700 mm) must be loaded into the cutting device to cut the target tubing. It can be seen that the energy density per unit volume of the required columns is low. This results in a longer size of the cutting device, which not only increases the cost of the cutting device, but also is not conducive to the cutting operation of the bent tubing working conditions underground. In addition, for cutting and demolition operations in field emergency environments, larger-sized cutting tools are very unfavorable to operate. Therefore, regulating the composition and content of the energetic material column to make it have a higher volume energy density and reducing the charge volume of the energetic column not only helps to shorten the size of the cutting device and reduce costs, but also increases the convenience of transportation, assembly and operation, which is of great significance for some scenes that require field cutting. Summary of the invention
[0004] The present invention aims to solve the problems existing in the above-mentioned prior art and provides an energetic charge for cutting with high volume energy density and a preparation method thereof.
[0005] The technical solutions adopted in the present invention are: A high volume energy density cutting energetic charge material, characterized in that it comprises the following components: 25-45 wt.% Al powder, 20-50 wt.% MnO 2 Powder, 20~50 wt.% PbO 2powder, 5~20 wt.% PTFE powder and 2~8 wt.% fluororubber.
[0006] Furthermore, the particle size of Al powder is 1-10 microns; 2 The particle size of the powder is 1~20 microns; PbO 2 The particle size of the powder is 1~20 microns; the particle size of the PTFE powder is 10~50 microns.
[0007] The present invention also discloses a method for preparing the material as claimed in claim 1, comprising the following steps: 1) Weigh Al and MnO 2 , PbO 2 and PTFE powder, and premixing; 2) The premixed powder is placed in the ball mill of an ultrasonic ball mill, and anhydrous ethanol is added to perform ball milling and mixing. This step uses an ultrasonic ball mill to make the mixing more uniform.
[0008] 3) pouring out the mixed composite powder slurry, drying it, and then granulating and sieving it to obtain a powdered energetic material pyrotechnic agent; 4) Add the pyrotechnic agent powder into a stainless steel ball mill containing a fluororubber acetone solution to mix the materials to obtain a liquid slurry; since the slurry has been mixed evenly before, ultrasonic ball milling is not required in this step.
[0009] 5) drying the liquid slurry to remove the acetone solvent, and then granulating and sieving to obtain a pyrotechnic agent powder with a fluororubber binder coated on the surface; 6) Pyrotechnic powder is placed into a mold for cold pressing and the energetic charge for cutting is obtained after the mold is opened.
[0010] Furthermore, in step 2), the premixed powder is placed in a ball mill of an ultrasonic ball mill, stainless steel balls are added, and the ball-to-material ratio is 2:1~1:2; the solid-liquid ratio of ball milling wet mixing is 10%~25%; the ball milling speed is 200~600 rpm, the ultrasonic frequency is 20~100 KHz, and the mixing time is 20~120 minutes.
[0011] Furthermore, in step 4), the ball-to-material ratio is 2:1-1:2; the concentration of the fluororubber acetone solution is 2-20 g / L, the ball milling speed is 200-600 rpm, and the mixing time is 20-120 minutes.
[0012] Furthermore, in step 6), the molding pressure is 60-150 MPa, and the holding time is 3-10 minutes.
[0013] The present invention has the following beneficial effects: (1) The energetic material charge of the present invention has a high volume energy release density and a stable combustion process.
[0014] (2) The energetic drug column of the present invention has good molding performance and a simple preparation method.
[0015] (3) The energetic charge of the present invention has good cutting and perforation effects. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a flow chart for the preparation of the energetic drug column in Example 1.
[0017] Figure 2 This is a diagram showing the cutting effect of the energetic charge on the steel plate in Example 1.
[0018] Figure 3 This is a diagram showing the cutting effect of the steel plate using the energetic charge in Comparative Example 1. DETAILED DESCRIPTION
[0019] The present invention will be further described below in conjunction with the accompanying drawings. Example 1
[0020] The energetic material raw materials were weighed according to the following formula: 21 wt.% Al powder, 30 wt.% MnO 2 Powder, 34 wt.% PbO 2 powder, 10 wt.% PTFE powder and 5 wt.% fluororubber. Figure 1 Preparation process.
[0021] Weigh Al and MnO in proportion 2 , PbO 2 and PTFE powder, put all the component powders into a plastic bag for simple manual shaking premixing, then put them into the ball milling jar of an ultrasonic planetary ball mill, add stainless steel balls, the ball-to-material ratio is 1:1, and add anhydrous ethanol, the solid-liquid ratio of ball milling wet mixing is 20%, and the ball milling mixing is carried out while ultrasonic wave is acting, the ball milling speed is 300rpm, the ultrasonic frequency is 50KHz, and the ultrasonic ball milling mixing time is 60 minutes.
[0022] After the ultrasonic ball milling is completed, the mixture containing the powder, steel balls and anhydrous ethanol is taken out, dried at 70°C, and granulated and sieved after being completely dried to obtain a powdered energetic material agent.
[0023] The pyrotechnic powder was added to a stainless steel ball mill containing a fluororubber acetone solution, stainless steel balls were added, and the mixture was mixed using a common ball mill. The ball-to-material ratio was 1:1; the concentration of the fluororubber acetone solution was 10 g / L, the ball mill speed was 300 rpm, and the mixing time was 120 minutes.
[0024] After the ball milling is completed, the liquid slurry is placed on a stainless steel tray, dried to remove the acetone solvent, and then granulated and sieved to obtain a pyrotechnic agent powder with a fluororubber binder coated on the surface.
[0025] Subsequently, a certain mass of energetic material powder is weighed and loaded into the grain forming mold for cold pressing. The molding pressure is 110 MPa, the pressure holding time is 3 minutes, and the mold is opened to obtain the energetic grain for cutting.
[0026] The volume energy density of the energetic material was found to be about 21 KJ / cm by oxygen bomb calorimeter. 3 After the energetic charge is loaded into the cutting device, it can form a good cutting and perforating effect on the metal steel plate, and the perforation diameter is about 9.0 mm. Figure 2 shown. Example 2
[0027] The energetic material raw materials were weighed according to the following formula: 17 wt.% Al powder, 10 wt.% MnO 2 Powder, 50 wt.% PbO 2 powder, 15 wt.% PTFE powder and 8 wt.% fluororubber.
[0028] Al, MnO 2 , PbO 2 It was put into a plastic bag together with PTFE powder and pre-mixed by simple manual shaking. Then it was put into the ball milling jar of an ultrasonic planetary ball mill. Stainless steel balls were added. The ball-to-material ratio was 1:1. Anhydrous ethanol was added. The solid-liquid ratio of ball milling was 10%. The ball milling was carried out while ultrasonic waves were applied. The ball milling speed was 200 rpm, the ultrasonic frequency was 25 KHz, and the ultrasonic ball milling mixing time was 120 minutes.
[0029] After the ultrasonic ball milling is completed, the mixture containing the powder, steel balls and anhydrous ethanol is taken out, dried at 70°C, and granulated and sieved after being completely dried to obtain a powdered energetic material agent.
[0030] The pyrotechnic powder was added to a stainless steel ball mill containing a fluororubber acetone solution, stainless steel balls were added, and the mixture was mixed using a common ball mill. The ball-to-material ratio was 1:1; the concentration of the fluororubber acetone solution was 5 g / L, the ball mill speed was 400 rpm, and the mixing time was 30 minutes.
[0031] After the ball milling is completed, the liquid slurry is placed on a stainless steel tray, dried to remove the acetone solvent, and then granulated and sieved to obtain a pyrotechnic agent powder with a fluororubber binder coated on the surface.
[0032] Subsequently, a certain mass of energetic material powder is weighed and loaded into the grain forming mold for cold pressing. The molding pressure is 60 MPa and the pressure holding time is 3 minutes. The mold is opened to obtain the energetic grain for cutting.
[0033] The volume energy density of the energetic material was found to be about 20 KJ / cm by oxygen bomb calorimeter. 3 After the energetic charge is loaded into the cutting device, it can form a better cutting and perforating effect on the metal steel plate. Example 3
[0034] The energetic material raw materials were weighed according to the following formula: 27 wt.% Al powder, 50 wt.% MnO 2 Powder, 10 wt.% PbO 2 powder, 5 wt.% PTFE powder and 8 wt.% fluororubber.
[0035] Al, MnO 2 , PbO 2 It was put into a plastic bag together with PTFE powder and pre-mixed by simple manual shaking. Then it was put into the ball milling jar of an ultrasonic planetary ball mill. Stainless steel balls were added. The ball-to-material ratio was 1:2. Anhydrous ethanol was added. The solid-liquid ratio of ball milling was 15%. The ball milling mixing was carried out while ultrasonic waves were applied. The ball milling speed was 600 rpm, the ultrasonic frequency was 100 KHz, and the ultrasonic ball milling mixing time was 20 minutes.
[0036] After the ultrasonic ball milling is completed, the mixture containing the powder, steel balls and anhydrous ethanol is taken out, dried at 70°C, and granulated and sieved after being completely dried to obtain a powdered energetic material agent.
[0037] The pyrotechnic powder was added to a stainless steel ball mill containing a fluororubber acetone solution, stainless steel balls were added, and the mixture was mixed using a common ball mill. The ball-to-material ratio was 1:2; the concentration of the fluororubber acetone solution was 2 g / L, the ball mill speed was 600 rpm, and the mixing time was 20 minutes.
[0038] After the ball milling is completed, the liquid slurry is placed on a stainless steel tray, dried to remove the acetone solvent, and then granulated and sieved to obtain a pyrotechnic agent powder with a fluororubber binder coated on the surface.
[0039] Subsequently, a certain mass of energetic material powder is weighed and loaded into the grain forming mold for cold pressing. The molding pressure is 150 MPa and the pressure holding time is 10 minutes. The mold is opened to obtain the energetic grain for cutting.
[0040] The volume energy density of the energetic material was found to be about 23 KJ / cm by oxygen bomb calorimeter. 3After the energetic charge is loaded into the cutting device, it can form a better cutting and perforating effect on the metal steel plate.
[0041] Comparative Example 1 The energetic material raw materials were weighed according to the following formula: 32 wt.% Al, 58 wt.% Fe 2 O 3 , 10 wt.% Ni, 10wt.% PTFE.
[0042] Weigh Al and Fe in proportion 2 O 3 and PTFE powder, put all the component powders into a plastic bag and shake them manually for premixing, then put them into the ball mill of an ordinary planetary ball mill, add stainless steel balls, the ball-to-material ratio is 1:1, and then ball milling is carried out, the ball milling speed is 300 rpm, and the ball milling mixing time is 60 minutes.
[0043] After the ball milling is completed, the mixture containing the powder and the steel balls is taken out, dried at 70°C, and sieved after being completely dried to obtain a powdered energetic material agent.
[0044] Subsequently, a certain mass of energetic material powder is weighed and loaded into the grain forming mold for cold pressing. The molding pressure is 110 MPa, the pressure holding time is 3 minutes, and the mold is opened to obtain the energetic grain for cutting.
[0045] The volume energy density of the energetic material was found to be about 14 KJ / cm by oxygen bomb calorimeter. 3 , which is much lower than the volume energy density of Examples 1, 2, and 3. After the energetic charge is loaded into the cutting device, the cutting and perforation effect of the metal steel plate is as follows Figure 3 As shown, the perforation diameter is approximately 5.6 mm, which is smaller than Figure 2 Cutting and perforation diameter of medium steel plate.
[0046] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.
Claims
1. An energetic charge material for cutting with high volume energy density, characterized in that: The invention comprises the following components: 15-30 wt.% of Al powder, 10-50 wt.% of MnO2 powder, 10-50 wt.% of PbO2 powder, 5-20 wt.% of PTFE powder and 2-8 wt.% of fluororubber.
2. A method for preparing the material according to claim 1, characterized in that: The steps include: 1) Weigh Al, MnO2, PbO2 and PTFE powders and premix them; 2) Put the premixed powder into a ball mill, add anhydrous ethanol, and perform ball milling; 3) pouring out the mixed composite powder slurry, drying it, and then granulating and sieving it to obtain a powdered energetic material pyrotechnic agent; 4) adding the pyrotechnic agent powder into a ball mill containing a fluororubber acetone solution to mix the materials to obtain a liquid slurry; 5) drying the liquid slurry to remove the acetone solvent, and then granulating and sieving to obtain a pyrotechnic agent powder with a fluororubber binder coated on the surface; 6) Pyrotechnic powder is placed in a mold for cold pressing and the energetic charge for cutting is obtained after the mold is opened.
3. The preparation method according to claim 1, characterized in that: In step 2), the premixed powder is placed in a ball mill of an ultrasonic ball mill, stainless steel balls are added, and the ball-to-material ratio is 2:1~1:2; the solid-liquid ratio of ball milling wet mixing is 10%~25%; the ball milling speed is 200~600 rpm, the ultrasonic frequency is 20~100 KHz, and the mixing time is 20~120 minutes.
4. The preparation method according to claim 1, characterized in that: In step 4), the ball-to-material ratio is 2:1-1:2; the concentration of the fluororubber acetone solution is 2-20 g / L, the ball milling speed is 200-600 rpm, and the mixing time is 20-120 minutes.
5. The preparation method according to claim 1, characterized in that: In step 6), the molding pressure is 60-150 MPa, and the holding time is 3-10 minutes.
6. The preparation method according to claim 1, characterized in that: Step 2) uses an ultrasonic ball mill.